Improvement in excavators



n M. M. HODGMANQ Improvement n Excavators.

No. 131,954. Pa'tentedcr. 8, 1872.

le K l a, Mi HV/il o n K7@ @al @af Marions M. noDGMAN, or WEYMOUTH, MAssAoHUWsEr'rs.

IMPRCVEMENT IN ExcAvA'roRs.

Specification .forming part of Letters Patent No. 131,954, dated October 8, 1872.

To all whom it may concern:

Be it known that I, MARCUS M. HODGMAN, of Veymouth, in the county of Norfolk, in the State of lvlassachusetts,have invented certain Improvements in Excavators, of which the following is a specification: V

The object of this invention is to improve the excavator patented to me April 18th,- 187], and numbered.113,883; and it consists in the ryng the implement to its work. B is an uplright mast with a center bore or hole, b', through its entire length, and in which bore or hole the operating chains or ropes Work. b is a slot in the back side, and at a proper distance above the foot of the mast, to receive a pulley, c, in the pulley-blockl). b" is a similar slot or inortise in the front side and near the top of the mast to receive pulleys d and d in pulley-block D. C is a large pulley at the foot of the mastwith a groove in its periphery, and is iixed in theV mastF by a hollow hub, b4,

that extends upward into the bore or hole b in mast B, and below the pulley far enough to forln a journal or piu to work freely in the step or box b, which is fast on the platform or base A, and in which `the mast B, by means of the hollow hub extending below the pulley C and into the step or box,wil1 freely revolve in either direction. i D and D' are pulley- 4blocks fast on opposite sides of the mast, and 'contain pulleys over which go the ropes or chains that move the shovel-stock and shovel. E is the boom or shovel-stock, constructed to embrace the hollow mast B, and slide between the sides of the mast and keepers outside of .the sides of the boom, and made fast to the mast while the underside of the shovel stock orboom rests upon rollers, that it may reciprocate the' moreeasily when required. F is the shovel, constructed in the usual manner, and hung to they-boom or stock E by the bent and pivoted bars f and guide-barsf, which have holes therein for limiting the vibration of the shovel in either direction. At the forward end of the boom or shovel stock is attached a contrivance for adjusting a plate to bear against the top of the shovel, while it is being forcedA forward to be filled, in order to accommodate the different angles at which the shovel may be in with relation to the bank, and the position of the machine for advantageous effect; and this contrivance consists of a plate, h, firmly attached'to the upper sido of the boom or stock E, and at its forward end at h3 is hin ged plate h. Plate h is adjusted to different angles by means of its being' hinged to a screw-bolt, h4, which passes upward between strengtheningplates It through plate h and bracket 11,5, and. by operating .a nut, h6, that is screwed onto the bolt h4, and is between plate It and bracket h5, as' seen in Fig.

2, the hinged plate h will be opened or closed as the nut h6 is turned in the direction to so open or close the plate. g isa springbumper rod placed in a proper block, g, and firmly attached to the boom or shovel stock E, in which is a spring, g, through which the bumper g passes. g is a plate for bumper g to strike against when the shovel is brought up to go into position to be dropped down to commence iilling, and is iirmly bolted to the mast B in such position that the bumper g will always strike against it, and in doing so the spring g will prevent any considerable jar from being communicated to the mast, while 'the plate g prevents any wear upon the mast,

as would be the case without this device, and

by which the mast is made to last much lon ger,

as no abrasion of the wood of the mast re` "of the shoulder j against the stop j, as seen in Figs. 6, 7, and 8. K is a projecting guideway attached to the mast B, a frontview of which is seen at Fig. 9, and a side sectional view at Fig. 10. The front edges of the pro plates are turned to form a right he side plates, and leave a space width to easily receive the thickatch I between the flanges 7c', so .o om with the shovel falls or drops i a position for forcing the shovel v the latch I passes into the open of the guide K, and the pin 714 on -tch 1 passes within the inwardlylges ofthe side plates, and thus on to the falling boom and shovel h drops below the ilan ges 7c; when l freely pass out of the guide-way. i. then ready to be forced forward .l by pulling upon the chain or rope which is attached to a hook or eye, -block D; tlience passing around 1e outer end of the boom or shovel n back and over pulley e in pull o the bore or hole b in mast B; j said bore below the bottom of .1d around pulley a5 to the power l to operate the excavator. When i d in the way described far enough ovel, the movement of chain or i pcd, and power is then applied to rope or chain m, one end of which l in a hook or eye, f1.4,.on pulley- -t is connected to the forward end or shovel stock E and shovel F, chain d5, bail f, and bent bars f; i ope or chain m goes upward to ulleyd in pulley-block D; thence ynd around pulley d3 in block d, around the upper pulley d in pulthen down in the bore or hole b of e bottom ofthe mast, and around he power, which will elevate the q its load, to any desired elevation. sed the mast and boom, with the rned around by a rope or chain id pulley G, and between guidel such position as is desired for contents in the shovel into some ace to receive it, by the ordinary eans now in use.

boom with its shovel is run tost, in order to get the shovel in sually strikes the mast with great s a consequence will in a short wear away the wood of the mast to its great injury, and perhaps final destruction; but by the device hereinabove described the mast is completely shielded andv protected from the effects of such shocks and blows, and will last an indefinite length of time by reason of such protection and construction. The means for adjusting the bearing at the end of the boom against the shovel is of great iinportance, as the same can be adjusted to any angle within the scope of the adjusting-screw, while the means for guiding the shovel in its downward descent to the position to commence its work at the nearest point possible to the mast is a desirable improvement upon the ordina-ry method. The hollow mast affords protection to the ropes or chains used to operate the machine, and also prevents anything from coming in contact with them while in operation. The mast is held in upright position in the usual way by attaching guys or braces to the plate at the upper end of the mast, and the other end to anchors at any proper position.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. Ihe combination of the mast B, having the longitudinal bore b1, pulley C, having the hollow hub b4 extending below and forming a pin or journal, with the step b, in which the hollow hub is inserted,thus forming the means of sustaining the mast and allowing it to be turned, substantially as described.

2. The combination of the spring bumper g upon the boom or shovel stock E with the plate g upon the mast B, substantially as described.

3. The combination of the adjustable hinged plate h upon the end of the boom or shovel stock E with the shovel F, constructed and arranged to operate in the manner substantially as described.

4. The combination of the drop-latch I, having the transverse pin 4 and attached to the boom or shovel stock E, as described, with the guide K on mast B, all constructed to operate substantially as set forth.

MARCUS M. HODGMAN.

Witnesses:

LEVI H. STRAW, JOSEPH BYRNE. 

